Basics and fundamentals.
Diversity and Maximum Demand
An explanation of diversity and how the maximum load of a circuit or complete electrical installation can be assessed.
Neutrals in AC electrical circuits
What a neutral wire is, how neutral is derived at the supply transformer and why a neutral wire isn't always safe.
Loop Impedance and Fault Current
Earth loop impedance, external and total impedance, plus fault current and how it relates to the choice of circuit breaker type.
Voltage Drop in Electrical Circuits
Voltage drop explained - why it occurs and how to minimise it.
Voltage, Current, Resistance & Power
Explanation of basic electrical terms voltage, current, resistance and power.